Refrigerating apparatus



July 30, 1957 PH|L|PP 2,801,045

REFRIGERATING APPARATUS Filed Oct. 8, 1954 INVENTOR. 4 56466 B u/PP irramsy United States Patent REFRIGERATING APPARATUS Lawrence A. Philipp,Detroit, Mich., assignor to American Motors Corporation, Detroit, Mich acorporation of Maryland This invention relates to'refrigeratingapparatus and more particularly tohermetically sealed motor-compressorunits for use in connection with such apparatus.

Itis an object of the present invention to provide an improvedarrangement for mounting a motor-compressor unit within a sealed casing.

It is another object of the present invention to provide an improvedmounting arrangement for a motor and compressor unit within a sealedcasing which will minimize and absorb the operational vibrations of themotor and compressor and retain same in proper position during operationand in transportation thereof.

It is another object of the present invention to provide an improvedmounting arrangement for a motor and compressor within a sealed casingwhich is simple in construction and permitting an easy and quickmounting of the motor and compressor and which is highly efiicient inuse.

Further objects and advantages of the present invention will be apparentfrom the following description, reference being had to the accompanyingdrawings, wherein a preferred form of the present invention is clearlyshown.

In the drawing:

Fig. 1 is a front view of a refrigerating apparatus embodying featuresof my invention and showing a portion thereof broken away;

Fig. 2 is a view taken along line 22 of Fig. 1 and showing a portionthereof broken away; and

Fig. 3 is a fragmentary view taken along line 3-3 of Fig. 1.

Shown in the drawing is a motor-compressor unit which comprises ingeneral a compressor 12 and an electric motor 14 mounted within a sealedcasing 18.

The casing 18 consists of an upper shell 20 and a lower shell 22 whichare welded together at their respective flanges 23 and 24 to form asealed chamber 26.

The compressor 12 includes a casting 28 having a cylinder block 30. Asleeve 32 is pressed in the block 30 to provide a cylinder 34. Avertically extending drive shaft 36 is journalled in a bearing 38provided in the casting 28. A piston 39 is connected to shaft 36 by aconnecting rod 40 for operation in the cylinder 34.

The motor 14 includes a rotor 42 mounted on the upper end of the shaft36 and a stator 43 mounted on the compressor casting 28. Thus thecasting 28 supports both the compressor and motor parts as a unit.

The supporting casting 28 is mounted upon a pair of resilient supportingunits 50 which are identical in construction. Each supporting unit 50comprises a bracket 54 having legs 56 and 58 which are welded to theside and bottom walls respectively of the lower shell 22. Extending fromleg 56 is a horizontally extended section 64 having a downwardlydepending vertical section 65 joined to leg 58. Secured on thehorizontal section 64 is an upwardly extending stud 66. The stud 66 isformed with a spiral groove 68 upon which is threaded one end of a ICCcoiled spring 70. The casting 28 includes two hollow bosses 72 which areidentical in shape. One of these bosses rests upon the upper end of onecoiled spring 70 and the other boss rests upon the upper end of theother coiled spring 70. Each boss 72 is provided with a reduced portion73 with one being received in one coiled spring and one in the other toprevent disengagement of the coiled springs from the bosses 72.

The supporting units 50 are located within the chamber 26 so that theunits are positioned diametrically opposite each other and on a linethat extends substantially through the center point of gravity of thecasting 28 and the motor and compressor parts supported thereby. Theunits 50 are positioned on opposite sides of the casing 18 and in closeproximity to the shell 22.

This arrangement serves not only to support but to balance the motor andcompressor in a vertical position.

Cooperating with the supporting units 51) is a stabilizing or snubberunit comprising a bracket 82, a coiled spring 84 and a lug 86 that isformed integrally with the casting 28. The' bracket 82 is formedU-shaped having arms 90 and 92 spaced in parallel relationship andjoined by a connecting section 94 which is welded to the side wall ofthe lower shell 22. The lug 86 extends to lie substantially midwaybetween arms 98 and 92 of the.bracket 82. .A spirally threaded opening83 extends through'the lug 86 into which 'is threaded the coiled spring84 until the mid-section of the spring is secured and held in the lug86. The ends of the spring 84 extend outwardly from opposite sides ofthe lug a substantially equal distance to engage against respective arms90 and 92 of the bracket 82. The arm 90 is formed with an inwardlydirected sleeve 96 which telescopes into the end of spring 84 to preventdisplacement of the spring from arm 90. A similar sleeve 98 is formed onarm 92 for holding the opposite end of spring 84 to the arm.

The stabilizing unit 80 is arranged to be located midwaycircumferentially on the shell 22 between the supporting units 50. Thespring 84 is mounted so that its axis extends parallel to the aforesaidline extending between the centers of the supporting units 50. Thoughthe axis of the shaft 36 may be to one side of the aforementioned centerpoint of gravity, it intersects a radial line constructed from thecenter point of gravity perpendicular to the axis of the spring 84 whilethe axis of the spring is tangent to the concentric rotation of therotor 44. This arrangement permits the stabilizing unit 80 to absorb andminimize the starting rotational shock upon the starting of the electricmotor 14 and absorb and minimize the shock in the stopping of theelectric motor, as well as preventing the rotation of the mechanismduring the operation thereof.

The stabilizing unit 80 co-operating with the supporting units 50 alsoprovides a third point of support to prevent rocking action of the motorand compressor as well as preventing side or lateral movement thereof.

To prevent the mechanism from being unseated from springs 70 by undueupward movement thereof, as may occur in transportation, the shaft 36 isprovided with an extension which terminates adjacent the top wall of theupper shell 20. The space between the end of shaft extension 110 and topwall is less than the length of the extension of each boss 72 into eachspring 70 so that the extension 110 will strike the top wall of theshell without permitting the disengagement of the springs 70 from bosses72. Secured to top wall of the casing 18 is a downwardly extended sleeve114 into which the shaft extension 110 projects which also serve tolimit movement and prevent displacement of the mechanism from itssupport should it be unduly tilted from a vertical position.

By the present mounting arrangement of two coiled springs mounted on thehorizontal; legs of the brackets. adjacent the bottom wall of the casingvery little vibrations are transmitted to the casing; Also by. thismounting and by the use of the snubber spring the motorcompressor unitremains improper position, during operation and in transportation. e

The arrangement further serves tominimizeand pre-.

vent bouncing of the mechanism from one spring 70 toward the other asthe springs 84 by its arrangement will resist twisting action. Thus thespring 84 serves not only to snub rotary or, vertical directedvibrations, but also rocking action as well. 'Byrarrangin'g thesupporting and snubbing units 50. adjacent tothe underside of themechanism there is eliminated any tendency for gyrating or rollingactionthere'by permitting a smoother spirit of the invention or from thescope of the appended" claims.

I claim:

1. Refrigerating apparatus comprising a casing, a pair of verticallyextending coiled springs within said casing said vertically extendingcoiled springs and connected substantially midway between its ends tosaid motorcompressor unit.

2. Refrigerating apparatus comprising a casing, a pair of bracketspositioned within said casing diametrically oppositeeach other with eachhaving a vertical leg secured to the bottom wall of said casing and eachhaving a horizontally extending leg secured to the side wall of saidcasing, vertically extending coiled springs mounted in said casing onsaid horizontally extending legs, a refrigerant compressing mechanismmounted in said casing on said springs, and a'single horizontallymounted coiled snubber spring secured to a side wall of said casingsubstantially midway circumferentially on the casing between saidvertically extending coiled 'spr' gs and to .said refrigerantcompressing mechanism l 7 References 'C itedin the file of vpatentUNITED STATES PATENTS Heitchuef Mar. 1, 1949

